Dorchester County is aware that some beekeepers in the area that was sprayed on Sunday lost their bee colonies.

意思是：some beekeepers lost their bee colonies.

多切斯特县当地政府已经意识到，在周日被喷洒过农药的地区，一些养蜂人失去了他们的蜂巢。

Dorchester county knew that some beekeepers in the area spraying on Sunday made their bee colonies lost.

意思是：some beekeepers made their bee colonies lost. 逻辑问题，不知何意？

私人消息中看到求助。你的分析错误，Mikee老师分析正确，that was sprayed on Sunday为定语从句修饰area。